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Quarterly consolidated information (unaudited information) (Details) - ARS ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly consolidated information (unaudited information) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 17,923 | $ 16,719 | $ 15,818 | $ 14,726 | $ 14,422 | $ 13,412 | $ 12,951 | $ 12,455 | $ 11,906 | $ 10,094 | $ 9,624 | $ 8,872 | $ 65,186 | $ 53,240 | $ 40,496
Operating income before D&A | 5,110 | 4,902 | 4,706 | 4,638 | 4,214 | 3,446 | 3,362 | 3,402 | 3,202 | 2,529 | 2,501 | 2,634 | 19,356 | 14,424 | 10,866
Operating income | 3,094 | 3,167 | 2,958 | 2,893 | 2,320 | 1,802 | 1,724 | 1,997 | 1,770 | 1,311 | 1,468 | 1,680 | 12,112 | 7,843 | 6,229
Financial results, net | (210) | (16) | (384) | 124 | (562) | (636) | (489) | (557) | (910) | (73) | (30) | (89) | (486) | (2,244) | (1,102)
Net income | 2,029 | 2,056 | 1,673 | 1,966 | 1,510 | 758 | 802 | 935 | 657 | 800 | 937 | 1,041 | 7,724 | 4,005 | 3,435
Net income attributable to Telecom Argentina | $ 1,989 | $ 2,026 | $ 1,660 | $ 1,955 | $ 1,504 | $ 746 | $ 800 | $ 925 | $ 646 | $ 801 | $ 928 | $ 1,028 | $ 7,630 | $ 3,975 | $ 3,403

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